docs: add document-feature Copilot custom skill definition

[v-spakirla]

Summary

Adds a Copilot custom skill definition (.github/skills/document-feature.md) that automates generating or updating developer documentation for Microsoft Teams platform features and creates a PR for human review.

What the skill does

When invoked via /document-feature <feature-description>, the skill:

1. Resolves the target — determines whether to create new docs or update existing ones, and maps to the correct folder under msteams-platform/.
2. Discovers repo conventions — reads adjacent files to learn frontmatter format, heading structure, callout syntax, branding, and TOC patterns.
3. Generates/updates documentation — writes content following Microsoft Learn style guidelines with proper frontmatter, code samples, and cross-references.
4. Updates navigation — adds entries to TOC.yml and whats-new.md as appropriate.
5. Validates content — checks frontmatter, links, style, and branding compliance.
6. Creates a pull request — commits changes and opens a PR with a structured summary and reviewer checklist.

Key design decisions

• One-shot execution — no mid-run prompts; runs fully automated.
• Safety-first — never deletes docs without replacement; never invents API behaviors.
• Repo-aware — discovers conventions from existing files rather than hardcoding.
• Branding-correct — enforces current product names (Microsoft 365 Agents Toolkit, App Manifest, etc.).
• Human-in-the-loop — outputs a PR, not a direct merge; flags ambiguities for reviewer attention.

Files

File	Action
.github/skills/document-feature.md	Added

Review checklist

• Skill phases cover the full documentation workflow
• Repo folder mapping is complete and accurate
• Branding mapping matches current guidance
• PR template is useful for reviewers
• Edge cases are handled appropriately

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Contributor License Agreement

Contribution License Agreement

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[learn-build-service-prod]

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[learn-build-service-prod]

Learn Build status updates of commit 0cf381f:

✅ Validation status: passed

File	Status	Preview URL	Details
.github/skills/document-feature.md	✅Succeeded

For more details, please refer to the build report.